Table - new custom field type

We need to insert a whole table as a custom field. example:

Heading1 | Heading2 | Heading3
---------------------------------------------
Label1 | Value1-1 | Value 1-2
Label2 | Value 2-1 | Value 2-2
..

The only way to create the above table today is by creating 4 separate custom fields. The problem is that our table is a lot larger than the one in the example (15 rows * 6 columns).